Hentai

Moves the log file path from the home directory to `/var/log` on Linux-like systems
and to `%LOCALAPPDATA%` on Windows. Also improves the GitHub issue templates and
implements a basic CLI:

cli
get help
hentai -h

download doujin
hentai -id 177013

check module version
hentai -version

Adds log handler to the `hentai` module and implements a fallback mechanism to
the `num_favorites` property of Hentai objects for recently uploaded doujins. This
version also deprecates `setup.cfg` and made a few additional changes to the project
structure, none of which should have any effect on users of this library.

Improves performance of `list` and `search` in `Tag` and changes the signature of
`search` to

- `search(option: Option, property_: str, value) -> Tag`

Improves overall test coverage and implements

- `search(value, property_: str='name') -> Tag`

as a static method.

In this version two new properties have been added to `Hentai` objects:

- `self.thread -> List[Comment]`
- `self.related -> List[Hentai]`

Additionally, datetime objects returned in any of this module's methods have been
made utc-timezone aware. URL properties in `Tag` objects now also return a fully
qualified path, e.g.

python
from hentai import Hentai, Tag

doujin = Hentai(177013)

old output:
/language/english/, /language/translated/
new output:
https://nhentai.net/language/english/, https://nhentai.net/language/translated/
print(Tag.get(doujin.language, 'url'))


The `Tag` class now also features a static `Tag.list` method for the following
tag types:

- `Option.Artist`
- `Option.Character`
- `Option.Group`
- `Option.Parody`
- `Option.Tag`
- `Option.Language`

which returns all tags available related to the options above. This may be used
in combination with the

- `search_by_tag(id_: int, page: int=1, sort: Sort=Sort.Popular, handler=RequestHandler()) -> List[Hentai]`

method for browsing the nhentai catalogue by tag ID.

After some reconsideration I came to the conclusion that it would be best when
none of the keyword arguments conflict with any of the built-in function from
python to further comply with PEP8 recommendations. Therefore, the following
arguments were renamed as followed:

- `property` becomes `property_`
- `id` becomes `id_`
- `format` becomes `format_`
- `type` becomes `type_`

The functions affected by this change were `Tag.get`, `Hentai.__init__`, `self.title`,
and `Hentai.exists`, respectively. In some instances, the previously missing return
type for some function signatures has been added back.